Nutrition is substances used in biosynthesis and energy production and therefore are required for all living things. Bacteria, like all living cells, require energy and nutrients to build proteins and structural membranes and drive biochemical processes. Bacteria require sources of carbon, nitrogen, phosphorous, iron and a large number of other molecules. Carbon, nitrogen, and water are used in the highest quantities. The nutritional requirements for bacteria can be grouped according to the carbon source and the energy source. Some types of bacteria must consume pre-formed organic molecules to obtain energy, while other bacteria can generate their own energy from inorganic sources.

7.  Photolithoautotroph
 Photoorganoheterotroph
 Chemolithoautotroph
 Chemolithoheterotroph
 Chemoorganoheterotroph

19.  Chemolithoheterotrophs – Stone Eaters
 Just as “organo” is the Greek root word for organic materials, “litho”
is the Greek word root for “stone.”
 Chemolithoheterotrophs are organisms that derive their energy from
inorganic minerals or other geological processes. Food sources for
chemolithotrophs can include elemental sulfur and elemental gas.
 Example- sulphur oxidising bacteria - baggiatoa

20.  Chemoorganoheterotrophs – Eaters of Living Things
 “Chemoorganoheterotroph” is a mouthful. But we’ve seen what
“chemotroph” and “chemoheterotroph” mean.
 “Chemoorganoheterotroph” just adds the term “organo,” for “organic”
molecules. Organic molecules are carbon-containing molecules such as
proteins, lipids, sugars, etc. that are usually associated with life.
 Chemoorganoheterotrophs, then, are eaters of organic molecules – and
where do you find organic molecules? Inside of living or dead
organisms